Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 525)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-7
N11G00G40X0Y0D00; Rapid to start point and cancel
compensation
N12M30; End of Program
Figure 21.5
Results of Cutter Compensation Program Example
Programmed path
Cutting tool center path
N3
N4
N5
N6
N7
N8
N9
N10
N11
N1
N2
In certain instances, cutter compensation creates a non-programmed move
called a generated block. These blocks are improve cycle time and
corner-cutting quality.
Cutter Compensation generates blocks for type A or B moves as follows:
Type of Move Type A Type B
Entry Move No block is generated Block is generated
Tool Path Block is generated Block is generated
Exit Move No block is generated Block is generated
Important: Cutter compensation generated blocks, as shown in
Figure 21.6, are created only under these conditions:
When is active and is cutting: which is:
G41 an inside angle less than 90 degrees
G42 an outside angle greater than 270
21.2
Cutter Compensation
Generated Blocks
G39, G39.1